I have endo- it's a mild case. I didn't know I had it until I had an exploratory laprascopic surgery to see why I couldn't get pregnant. The surgeons found endometriosis growth around my tubes and cleared that out. They told me the optimal time to try to get pregnant naturally is within 6 months of the surgery.

We had other fertility issues besides endometriosis, so we still ended up doing IVF ICSI.

Other than birth control pills, staying pregnant and laprascopic surgery, I don't have any advice on slowing the growth.